Milwaukee's SDS-Plus MX4 4-Cutter Drill Bits, 1/2 in. X 10 in. X 12 in., boast solid carbide heads for up to 5x longer life in concrete with rebar. Equipped with rebar guards for maximum durability, these bits feature sharp centering tips for precise spot drilling in concrete and metal decking. The 4-cutter design prevents rebar lock-up, minimizing downtime. Variable flutes remove dust swiftly, reducing heat and enabling up to 20% more holes per battery charge. A wear mark indicator signals the end of the bit's ANSI-compliant life. Ideal for concrete with rebar and masonry applications.